Would be cool if:

• Identity command accepts NBT data (like cat styles, snow foxes etc.)
• Better pehkui support or build-in commands for hitbox and eye hight scaling.
• Attribute generic.max_health no longer sets to 20.0 on identity unequip if health scaling is off.
• Ability to play different mob animations via command. Like cat sleeping animation(state) or fox jump. Huge for datapacking.

And that all it takes to be the best morph mod I could ever imagine. Thanks.

NBT command support:

/identity equip Player245 minecraft:fox {"Type":"snow"}

/identity grant Player715 fox {"Type":"snow"}

(also works with revoke)

+ scaling health fixed as requested

might be better if you could use type notation:
/identity grant @s minecraft:fox[type=snow]